package com.zz.cogo.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.handler.predicate.PredicateDefinition;
import org.springframework.cloud.gateway.route.RouteDefinition;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

@Component
@Primary
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

    public static final String API_URI = "v2/api-docs";

    private static final Logger log = LoggerFactory.getLogger(SwaggerResourceConfig.class);

    private final RouteLocator routeLocator;

    private final GatewayProperties gatewayProperties;

    public SwaggerResourceConfig(RouteLocator routeLocator, GatewayProperties gatewayProperties) {
        this.routeLocator = routeLocator;
        this.gatewayProperties = gatewayProperties;
    }

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        for (RouteDefinition routeDefinition : gatewayProperties.getRoutes()) {
            if (routes.contains(routeDefinition.getId())) {
                for (PredicateDefinition predicateDefinition : routeDefinition.getPredicates()) {
                    if (("Path").equalsIgnoreCase(predicateDefinition.getName())) {
                        resources.add(
                                swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
                                    .get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                    .replace("**", API_URI)
                                )
                        );
                    }
                }
            }
        }

        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        log.info("name:{},location:{}", name, location);
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }

}
